Gunther Hagleitner created HIVE-8179:
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Summary: Fetch task conversion: Remove some dependencies on AST
Key: HIVE-8179
URL: https://issues.apache.org/jira/browse/HIVE-8179
Project: Hive
Issue Type: Bug
Reporter: Gunther Hagleitner
Assignee: Gunther Hagleitner
fetch task conversion is does some strange things:
For instance: select * from (select * from x) t, wont get converted even though
it's the exact same operator plan as: select * from x.
Or: select * from foo will get converted with minimal, but select <list all
columns of foo> from foo won't.
We also check the AST for group by etc, but then do the same thing in the
operator tree again.
I'm also wondering why we ship with "moar" as default, but test with "minimal"
in the unit tests.
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